[higherpurpose]

You will get a faster emulator, but since x86 is used on like sub 1 percent Android devices, won't that be more like using a simulator, which would make it just as useless/useful as a simulator? Does the x86 image contain support for ARM, too?

[ZoFreX]

For most cases the underlying architecture doesn't really matter. "As useful as a simulator" is also quite a high standard for Android, seeing as there is no simulator available.